linux-stable/ipc
Davidlohr Bueso f3713fd9cf ipc,mqueue: remove limits for the amount of system-wide queues
Commit 93e6f119c0 ("ipc/mqueue: cleanup definition names and
locations") added global hardcoded limits to the amount of message
queues that can be created.  While these limits are per-namespace,
reality is that it ends up breaking userspace applications.
Historically users have, at least in theory, been able to create up to
INT_MAX queues, and limiting it to just 1024 is way too low and dramatic
for some workloads and use cases.  For instance, Madars reports:

 "This update imposes bad limits on our multi-process application.  As
  our app uses approaches that each process opens its own set of queues
  (usually something about 3-5 queues per process).  In some scenarios
  we might run up to 3000 processes or more (which of-course for linux
  is not a problem).  Thus we might need up to 9000 queues or more.  All
  processes run under one user."

Other affected users can be found in launchpad bug #1155695:
  https://bugs.launchpad.net/ubuntu/+source/manpages/+bug/1155695

Instead of increasing this limit, revert it entirely and fallback to the
original way of dealing queue limits -- where once a user's resource
limit is reached, and all memory is used, new queues cannot be created.

Signed-off-by: Davidlohr Bueso <davidlohr@hp.com>
Reported-by: Madars Vitolins <m@silodev.com>
Acked-by: Doug Ledford <dledford@redhat.com>
Cc: Manfred Spraul <manfred@colorfullife.com>
Cc: <stable@vger.kernel.org>	[3.5+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-02-25 15:25:45 -08:00
..
compat.c ipc: fix compat msgrcv with negative msgtyp 2014-01-27 21:02:40 -08:00
compat_mq.c ipc: whitespace cleanup 2014-01-27 21:02:39 -08:00
ipc_sysctl.c ipc: whitespace cleanup 2014-01-27 21:02:39 -08:00
ipcns_notifier.c
Makefile Add generic sys_ipc wrapper 2010-03-12 15:52:32 -08:00
mq_sysctl.c ipc,mqueue: remove limits for the amount of system-wide queues 2014-02-25 15:25:45 -08:00
mqueue.c ipc,mqueue: remove limits for the amount of system-wide queues 2014-02-25 15:25:45 -08:00
msg.c ipc,msg: document barriers 2014-01-27 21:02:40 -08:00
msgutil.c ipc, msg: fix message length check for negative values 2013-11-13 12:09:36 +09:00
namespace.c ipc: drop ipc_lock_by_ptr 2013-09-11 15:59:44 -07:00
sem.c ipc: remove braces for single statements 2014-01-27 21:02:39 -08:00
shm.c ipc: standardize code comments 2014-01-27 21:02:39 -08:00
syscall.c get rid of union semop in sys_semctl(2) arguments 2013-03-05 15:14:16 -05:00
util.c ipc: delete seq_max field in struct ipc_ids 2014-01-27 21:02:40 -08:00
util.h ipc: delete seq_max field in struct ipc_ids 2014-01-27 21:02:40 -08:00